Magnetoelectric control of spin helicity and nonreciprocal charge transport in a multiferroic metal
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| Format: | Preprint |
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2025
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| _version_ | 1866909615539617792 |
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| author | Yamaguchi, Daiki Kitaori, Aki Nagaosa, Naoto Tokura, Yoshinori |
| author_facet | Yamaguchi, Daiki Kitaori, Aki Nagaosa, Naoto Tokura, Yoshinori |
| contents | A multiferroic state with both electric polarization ($P$) and magnetization ($M$) shows the inherently strong $P$-$M$ coupling, when $P$ is induced by cycloidal (Néel-wall like) spin modulation. The sign of $P$ is determined by clockwise or counterclockwise rotation of spin, termed the spin helicity. Such a multiferroic state is not limited to magnetic insulators but can be broadly observed in conductors. Here, we report the current-induced magnetoelectric control of the multiferroics in a helimagnetic metal YMn$_6$Sn$_6$ and its detection through nonreciprocal resistivity (NRR). The underlying concept is the coupling of the current with the toroidal moment $T \sim P \times M \sim (\hat{q} \times χ_v) \times M$ as well as with the magneto-chirality $χ_v \times M$, where $\hat{q}$ and $χ_v$ being the unit modulation wave vector and the vector spin chirality, respectively. We furthermore observe an enhancement of NRR by the spin-cluster scattering via $χ_v$ and its fluctuation. These findings may pave a way to exploration of multiferroic conductors and application of the spin-helicity degree of freedom as a state-variable. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_23261 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Magnetoelectric control of spin helicity and nonreciprocal charge transport in a multiferroic metal Yamaguchi, Daiki Kitaori, Aki Nagaosa, Naoto Tokura, Yoshinori Materials Science A multiferroic state with both electric polarization ($P$) and magnetization ($M$) shows the inherently strong $P$-$M$ coupling, when $P$ is induced by cycloidal (Néel-wall like) spin modulation. The sign of $P$ is determined by clockwise or counterclockwise rotation of spin, termed the spin helicity. Such a multiferroic state is not limited to magnetic insulators but can be broadly observed in conductors. Here, we report the current-induced magnetoelectric control of the multiferroics in a helimagnetic metal YMn$_6$Sn$_6$ and its detection through nonreciprocal resistivity (NRR). The underlying concept is the coupling of the current with the toroidal moment $T \sim P \times M \sim (\hat{q} \times χ_v) \times M$ as well as with the magneto-chirality $χ_v \times M$, where $\hat{q}$ and $χ_v$ being the unit modulation wave vector and the vector spin chirality, respectively. We furthermore observe an enhancement of NRR by the spin-cluster scattering via $χ_v$ and its fluctuation. These findings may pave a way to exploration of multiferroic conductors and application of the spin-helicity degree of freedom as a state-variable. |
| title | Magnetoelectric control of spin helicity and nonreciprocal charge transport in a multiferroic metal |
| topic | Materials Science |
| url | https://arxiv.org/abs/2503.23261 |